This rulemaking implements provisions of the Energy Independence and Security Act of 2007 (EISA) that require the U.S. Department of Energy (DOE) to establish revised-performance standards for the construction of all new Federal buildings, including commercial, multi-family high-rise residential and low-rise residential buildings. This rulemaking will specifically address the reduction of fossil fuel-generated energy consumption in new buildings and buildings undergoing major renovations, as well as how agencies may petition DOE for a downward adjustment of the requirements if they believe meeting required energy reduction levels would be technically impracticable. DOE has published a supplemental proposal with a new focus that accounts for the needs of Federal agencies and the goals of President Biden’s Administration and responds to comments received on prior rulemaking documents. This document proposes revised Federal building energy performance standards that would require reductions in Federal agencies’ on-site use of fossil fuels (which include coal, petroleum, natural gas, oil shales, bitumens, tar sands, and heavy oils) consistent with the targets of ECPA and EISA and provides processes by which agencies can petition DOE for the downward adjustment of said targets for buildings. This effort was previously reported as the Fossil Fuel-Generated Energy Consumption Reduction for New Federal Buildings and Major Renovations of Federal Buildings rulemaking.